New Army "Caliber Configuration Study"

[BluntForceTrauma]

And BTW, if you're really concerned about tanks, the 84mm HEAT rounds are far more capable of defeating armor, than the 25mm and 40mm grenades can ever hope of being, so you may wish to re-evaluate.

No, no, KEEP the 84mm CG for tanks and big stuff but ADD a new 40mm High Velocity, Recoilless, Shoulder-Fired, Laser-Ranged, Air-Burst, Grenade Launcher (HVRSFLRABGL for short ). Something like, oh, the external diameter of the Russian RPG launcher but firing cartridge-type grenades. Making the caliber 40mm instead of 84mm allows one to carry more rounds. This would replace things like the M203 and would be just as ubiquitous in the squad.

As LR noted, while your ARs and LMGs are suppressing and pinning down the enemy, your grenadier is lazing the range for a close proximity air-burst.

John